[Chu, Yu-Ming] Hunan City Univ, Coll Sci, Yiyang 413000, Hunan, Peoples R China.
[Chu, Yu-Ming] Huzhou Univ, Dept Math, Huzhou 313000, Zhejiang, Peoples R China.
[Chu, Yu-Ming] Hangzhou Normal Univ, Inst Adv Study Honoring Chen Jian Gong, Hangzhou 311121, Zhejiang, Peoples R China.
[Yassen, Mansour F.] Prince Sattam Bin Abdulaziz Univ, Dept Math, Coll Sci & Humanities Al Aflaj, Al Aflaj 11912, Saudi Arabia.
[Yassen, Mansour F.] Damietta Univ, Fac Sci, Dept Math, Dumyat 34517, Egypt.